Andesine stones are in the feldspar group, specifically plagioclase feldspar. Rare gem-quality andesine is most prized in cherry red, though it also comes in pink, orange, and green shades.
You’ll also see andesine-labradorite, an opaque mixture of andesine and labradorite found in brown, peach, orange, or red hues. You can even find color-changing andesine stones that shift from red or purple to green under different types of lighting.
Andesine is nicknamed “Stone of the Congo” for its discovery in South America.
FAQs
What is andesine feldspar?
Andesine is a type of plagioclase feldspar, which are all different mixtures of albite and anorthite. The albite to anorthite ratio in andesine stones is 50 to 70 percent albite and 30 to 50 percent anorthite — labradorite is 50 to 70 percent anorthite, so andesine-labradorite is between the two.
The name “andesine” is in reference to the Andes Mountains, an abundant source of the mineral.
Is andesine the same as labradorite?
Not exactly. Andesine and labradorite are different types of plagioclase feldspars with close compositions, but labradorite has a distinctive metallic schiller called labradorescence. Andesine-labradorite, though, has a composition between the two.
What is the difference between andesine and sunstone?
“Sunstone” is more of a marketing term for feldspars with a sunny orange, yellow, or brown hue and often aventurescence (a metallic glittering surface). Some andesines and andesine-labradorite stones classify as sunstones, but sunstones can also fall under other types of feldspars.
What colors are available in andesine gemstones?
Andesine stones can be shades of red, pink, orange, yellow, green, white, or gray. Hematite and copper impurities lead to the famous red and orange andesine stones. High copper levels can also lead to green hues, though.
Generally, bright and pure reds are most valuable for andesine or andesine-labradorite, along with color-changing andesine. However, many bright red andesines — often labeled Tibetan or Congolese — are actually treated Chinese andesines.
What is the color change of andesine?
Rare color-changing andesine gemstones can be shades of purple or red under incandescent lighting, then shift to shades of green under daylight or fluorescent lighting.
Where is andesine found?
Besides the Andes Mountains, andesine stones suitable for cutting into gems mainly come from Japan and Oregon (USA). Pale andesines that get treated to become red often come from Tibet, Mongolia, or Mexico.
What is andesine used for?
Most andesine stones aren’t gem-quality, but the mineral is otherwise abundant and has various industrial uses. The main uses are:
- > Geological Research — Helps researchers learn about the geological history of andesine’s various host rocks
- > Pottery — Lowers the melting point & increases durability when making glass or ceramics
- > Filler — Improves resistance to wear & longevity as an abrasive filler in products like paint, rubber, glue, and plastic
What is the spiritual meaning of andesine?
Andesine symbolizes spiritual awakening, clarity, growth, transformation, and balance. Energy healers use andesine-labradorite for grounding, opening the heart chakra, and lowering stress.
Is andesine valuable?
It can be. Untreated, gem-quality andesine stones are rare, ranging from $50 up to $1,700 per carat for high-quality gems or $10 to $20 per carat for lower quality gems. Rough andesine costs between $1 to $20 per carat, while cabochons are about $10 to $60 per carat.
How should I care for andesine stones?
Andesine has mid-range hardness (6 to 6.5) and perfect cleavage, so you’ll want protective settings for jewelry. Clean andesine with warm water, mild soap, and a soft cloth. Dry it completely and store your andesine stone in a cool, dark place separately from other gems.
Keep andesine stones away from extreme heat and harsh chemicals. Remove andesine jewelry before strenuous activities.
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